glabella (n.) Look up glabella at Dictionary.com
"space between the eyebrows," 1590s, Modern Latin, noun use of fem. of adjective glabellus "without hair, smooth," diminutive of glaber "smooth, bald," from PIE *gladh- "smooth" (see glad) + diminutive word-forming element -ella. As the word for a part of the head of a trilobite, from 1849.